[Lilladancer]

Okay... I'm prepared to feel stupid. What does "Does not like recipient" mean in an email failure notice?

I have a mailing list of several hundred for my classes (they all voluntarily signed up for it), and I like to weed out as many bad email addresses as I can. Sometimes certain people's emails will result in a failure notice one time, but then they are fine again the next, depending on what the reason was for the failure notice. I don't want to delete them if it's a temporary problem, but I do want to delete if it's a permanent one, to pare down my list.

In my mind, "recipient" would mean the person I sent the email to. But now I'm wondering if "recipient" means the sender, and if this means that my email is being rejected as spam or has been blocked. Students can ask to be taken off the list at any time, but I'm wondering if some people are embarrassed to ask and just block it instead.

Any insights from techies out there?